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Re: ubuntu virtualization options when no HW virt support?

Subject: Re: ubuntu virtualization options when no HW virt support?
From: Liam Proven
Date: Sun, 27 Jun 2010 12:42:34 +0100
2010/6/27 Markus Schönhaber <ubuntu-users@xxxxxxxxxxxxxxxxxxxxx>:
> 27.06.2010 02:43, Liam Proven:
>
>> 2010/6/27 Markus Schönhaber <ubuntu-users@xxxxxxxxxxxxxxxxxxxxx>:
>>> 27.06.2010 02:18, Liam Proven:
>>>
>>>> For server virtualisation, not consumer desktop virtualisation, there
>>>> is Xen and KVM, but both require hardware virtualisation support.
>>>
>>> No.
>>> Xen does require hardware virtualization support to run guests in HVM
>>> mode. But if one only wants to run paravirtualized guests, it's possible
>>> to do so on a System/CPU without VT extensions.
>>
>> True, one can use paravirtualisation without VT or AMD-V, but it's not
>> much use
>
> It may not be of much use for you but it's *very* useful for me. And
> neither of us can judge of how much use it may be for others.
>
>> and only certain FOSS OSs will run within it.
>
> Yes, that's basically what paravirtualization is about.
>
>> These days, for
>> Xen to have functional parity with other hypervisors, you need VT/AMD-V.
>
> Maybe. But that doesn't change the fact, that the statement
> "Xen and KVM, but both require hardware virtualisation support"
> is not true.
>
> To explicitly state the difference (again):
> KVM:
> No hardware virtualization -> No KVM whatsoever.
> XEN:
> No hardware virtualization -> PV guests: yes. HV guests: no.

Good for you. You are correct, technically, but trying to explain to
the average user that /certain/ OSs /can/ run under this program on
one type of CPU but on another type of CPU it can run any OS is asking
for trouble.

Bear in mind we are replying to a thread started by an OP who does not
know the difference between QEMU and KVM. I think that in your efforts
to make the answer more technically correct you are muddying the
waters and making said answer less clear, less helpful and less
informative.

-- 
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